After installing a Package, a Statistical Report that was previously configured to display as a Chart and Data is reverted to showing Data Only. The Report Filter includes a condition where a Record Permission field equals the Current User. The Report can only be saved in Chart Only format by someone who sees data in the report. Since the user creating the Package doesn't have records that meet the Filter, the Package brings over the Report in Data Only format.
In the past when this situation has happened, users:
Were not able to identify the root cause,
Saw it as an unknown intermittent problem (possibly a bug with the package process),
Opted to address the problem post-install.
Login to Source environment as someone who is a Report Administrator and who can see data in the Report. As the Report Administrator, save the Report in Chart and Data format and as a Global Report.